Hi all,
Hardware:
adis16505-3
Esp32-S3-wroom-2
Issue:
I'm running into trouble trying to read the Prod Id I'm just getting all 0's out. I have the IMU on the SPI2 pins and set up the SPI channel at 1MHz. I initially created the SPI cmd as described in the data sheet as:
uint16_t tx_data = (0 << 15) | (reg_addr << 8 );
But I noticed on the scope that the DIN line seemed to be shifted to the right, see the second picture against the 3rd picture.
I tried switching it to
uint16_t tx_data = reg_addr;
not shifting it at all and that produced a scope perfectly resembling the data sheets example, see the last picture.
Code:
Reading register : 0x72
SPI Config:
spi_bus_config_t buscfg = {
.miso_io_num = PIN_NUM_MISO,
.mosi_io_num = PIN_NUM_MOSI,
.sclk_io_num = PIN_NUM_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 4 * 1024
};
spi_device_interface_config_t devcfg = {
.clock_speed_hz = 1 * 1000 * 1000, // 1 MHz to meet timing requirements
.mode = 3, // SPI mode 3 (CPOL=1, CPHA=1)
.spics_io_num = PIN_NUM_CS,
.cs_ena_pretrans = 8, // Ensure CS is activated 8 SPI clock cycles before transmission
.cs_ena_posttrans = 8, // Ensure CS stays active 8 SPI clock cycles after transmission
.input_delay_ns = 25, // Based on tDAV and tDSU requirements (typical 25 ns)
.queue_size = 3
};
Reading attempt:
esp_err_t imu_read_register(spi_device_handle_t spi, uint8_t reg_addr, uint16_t *data) {
uint16_t tx_data = (0 << 15) | (reg_addr << 8); // Read command (0), followed by the 7-bit address and 8 don't care bits
uint8_t rx_buffer[2] = {0x00, 0x00};
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.length = 16; // 16 bits for the transaction
t.tx_buffer = &tx_data;
t.rxlength = 16; // 16 bits to read
t.rx_buffer = rx_buffer;
esp_err_t ret = spi_device_transmit(spi, &t);
if (ret == ESP_OK) {
*data = (rx_buffer[0] << 8) | rx_buffer[1];
ESP_LOGI(TAG, "Read from register 0x%02X: 0x%04X", reg_addr, *data);
} else {
ESP_LOGE(TAG, "Failed to read register 0x%02X: %s", reg_addr, esp_err_to_name(ret));
}
return ret;
}
I only have a 2 channel scope so forgive the fragmentation of this snippets.
CS over SCLK
SCLK over DIN : Here you can see DIN is shifted to the right of what it should be
Data sheet example
SCLK over DIN: Shifted to the left matching the data sheet
No matter what I try though I always get 0's from DOUT.
Are there any examples using the espressif toolchain I could reference?
*Separate question: I looked at the analog GitHub and it has a driver library for the 164X, I was wondering if there's an updated one for the 16505 available?
Best Regards,
Wade
